S01 E05 · Lost Keys
Grandma and Mossy the dog visit Topsy and Tim but when it's time to take them home for Mossy's tea, Dad simply cannot find his house keys anywhere.

S01 E06 · Dog Day
Topsy and Tim look after Grandma's dog, Mossy, with the help of Tim's best friend Tony Welch. When Mossy starts being a bit naughty, they realise it's time for her walk.

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Topsy and Tim is a series of children's books written by Jean Adamson and Gareth Adamson about twins and their adventures. They were first published in 1960 and were relaunched in new editions in February 2003